Convert JSON to geoJSON

convertJson.js

/*
  Warning : This is overwrite .geojson filename in the directory with same filename as .json file  
  To run the script:
  
  node convertJson.js <JSON Filename without extension>
  
*/


var Readable = require('stream').Readable
var fs = require('fs')

var filename

process.argv.forEach(function(val, index, array) {
	filename = val
})

var input = `${filename}.json`
var output = `${filename}.geojson`
var json = fs.createReadStream(input)

var header = new Readable()
header.push(`{ "type": "FeatureCollection","features":`)
header.push(null)
var footer = new Readable()
footer.push(`}`)
footer.push(null)

header.pipe(fs.createWriteStream(output))
header.on('end', function() {
	json.pipe(fs.createWriteStream(output, { 'flags': 'a', 'encoding': 'utf8', 'mode': '0666' }))
	json.on('end', function() {
		footer.pipe(fs.createWriteStream(output, { 'flags': 'a', 'encoding': 'utf8', 'mode': '0666' }))
		footer.on('end', function() {
			console.log('done')
		})
	})
})